Spreads top of sweat pants (6)
I believe the answer is:
strews
'spreads top' is the definition.
'strews' can be an answer for 'spreads' (strewing is a kind of spreading). I am not sure about the 'top' bit.
'sweat pants' is the wordplay.
'sweat' becomes 's' (this could be a standard abbreviation which I don't know about).
'pants' becomes 'trews' (trews is a kind of pants).
's'+'trews'='STREWS'
'of' is the link.
Can you help me to learn more?
(Other definitions for strews that I've seen before include "Spreads by scattering" , "Untidily throws down" , "Scatters about" .)