Very involved in footwear push (5)
I believe the answer is:
shove
'push' is the definition.
(shoving is a kind of pushing)
'very involved in footwear' is the wordplay.
'very' becomes 'v' (abbreviation).
'involved in' is an insertion indicator.
'footwear' becomes 'shoe' (shoe is a kind of footwear).
'v' placed within 'shoe' is 'SHOVE'.
(Other definitions for shove that I've seen before include "Push (or what it comes to!)" , "Push rudely" , "Push in a rude manner" , "Jostle" , "Barge" .)