Quite high during play (7)
I believe the answer is:
totally
'quite' is the definition.
(quite can mean totally or completely)
'high during play' is the wordplay.
'high' becomes 'tall' (similar in meaning).
'during' is an insertion indicator.
'play' becomes 'toy' (synonyms).
'tall' going inside 'toy' is 'TOTALLY'.
(Other definitions for totally that I've seen before include "Fully, completely" , "in every respect" , "Clean" , "to the nth degree" , "Altogether" .)