Pressure with rent as part of salary that's deficient (10)
I believe the answer is:
incomplete
'deficient' is the definition.
(thesaurus)
'pressure with rent as part of salary' is the wordplay.
'pressure' becomes 'p' (abbreviation).
'with' is a charade indicator (letters next to each other).
'rent' becomes 'let' (I've seen this in another clue).
'as part of' is an insertion indicator.
'salary' becomes 'income' (I've seen this before).
'p'+'let'='plet'
'plet' inserted inside 'income' is 'INCOMPLETE'.
'that's' acts as a link.
(Other definitions for incomplete that I've seen before include "not done" , "Not whole" , "Lacking" , "Unfinished" , "not sufficient" .)