Close-lipped (8)
(Other definitions for discreet that I've seen before include "Unobtrusive; careful and prudent" , "Intentionally unobtrusive" , "Cautious, doesn't give away secrets" , "Unobtrusive, circumspect" , "Diplomatic" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">close-lipped</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for reticent that I've seen before include "Holding back" , "'Self-effacing, restrained (8)'" , "Disinclined to speak" , "Reserved, loath to talk" , "Reserved, not revealing thoughts readily" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">close-lipped</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for mum that I've seen before include "Informal palindromic mother" , "member of the family" , "Keep it secret from mother?" , "Silent; parent" , "Parent - shtoom" .)