Yielding resistance in uncontrollable dinner urges (12)
I believe the answer is:
surrendering
'yielding' is the definition.
(surrendering is a kind of yielding)
'resistance in uncontrollable dinner urges' is the wordplay.
'resistance' becomes 'r' (abbreviation).
'in' means one lot of letters goes inside another.
'uncontrollable' indicates an anagram (I've seen this in other clues).
'dinner'+'urges'='dinnerurges'
'dinnerurges' is an anagram of 'surendering'.
'r' inserted into 'surendering' is 'SURRENDERING'.
(Another definition for surrendering that I've seen is " Giving up".)