Little pets seizing half of my footwear (5)
I believe the answer is:
pumps
'footwear' is the definition.
(pumps is a kind of footwear)
'little pets seizing half of my' is the wordplay.
'little pets' becomes 'pups' (puppies).
'seizing' is an insertion indicator.
'half of' suggests halving the letters.
'my' with half the letters taken is 'm'.
'pups' placed around 'm' is 'PUMPS'.
(Other definitions for pumps that I've seen before include "leading questions" , "Water-raising devices" , "Shoes; inflaters" , "Forces liquid to move; light shoes" , "Light dancing shoes - force air into" .)