Limited stress good for junior (9)
I believe the answer is:
underling
'junior' is the definition.
(thesaurus)
'limited stress good for' is the wordplay.
'limited' means to remove the last letter.
'stress' becomes 'underline' (underlining is a kind of stressing).
'good for' becomes 'g' (I've seen this in other clues).
'underline' with its final letter removed is 'underlin'.
'underlin'+'g'='UNDERLING'
(Other definitions for underling that I've seen before include "Lackey" , "Subordinate" , "A junior" , "maid perhaps" .)