Love comes in no time, wildly, for passion (7)
I believe the answer is:
emotion
'passion' is the definition.
(I've seen this before)
'love comes in no time wildly' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'comes in' means one lot of letters goes inside another.
'wildly' indicates an anagram.
'no'+'time'='notime'
'notime' anagrammed gives 'emotin'.
'o' placed inside 'emotin' is 'EMOTION'.
'for' is the link.
(Other definitions for emotion that I've seen before include "sense" , "Anger, perhaps" , "Hatred or love, say" , "Mental feeling" , "Agitation of mind" .)