Get too big for playing golf with our two (7)
I believe the answer is:
outgrow
'get too big for' is the definition.
(I've seen this before)
'playing golf with our two' is the wordplay.
'playing' is an anagram indicator.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'with' is a charade indicator (letters next to each other).
'our'+'two'='ourtwo'
'g' put after 'ourtwo' is 'ourtwog'.
'ourtwog' is an anagram of 'OUTGROW'.
(Other definitions for outgrow that I've seen before include "Leave (something) behind as one matures" , "Develop faster or become taller than" , "excel in development" , "Develop beyond" , "Get bigger" .)