Resented six in dire need (6)
I believe the answer is:
envied
'resented' is the definition.
(I've seen this in another clue)
'six in dire need' is the wordplay.
'six' becomes 'VI' (Roman numerals).
'in' means one lot of letters goes inside another.
'dire' indicates anagramming the letters.
'need' anagrammed gives 'ened'.
'vi' inserted inside 'ened' is 'ENVIED'.
(Other definitions for envied that I've seen before include "Was jealous of (someone)" , "Looked greenly" , "Was jealous of, begrudged" , "Begrudged, coveted" , "Desired" .)