Linnet flying round east not tough (7)
I believe the answer is:
lenient
'not tough' is the definition.
(I've seen this in another clue)
'linnet flying round east' is the wordplay.
'flying' indicates an anagram (letters fly around into new positions).
'round' means one lot of letters goes inside another.
'east' becomes 'e' (abbreviation).
'linnet' with letters rearranged gives 'lenint'.
'lenint' enclosing 'e' is 'LENIENT'.
(Other definitions for lenient that I've seen before include "Inclined to let people off lightly" , "Clement" , "Compassionate" , "Forgiving, soft" , "Indulgent, lax" .)