Being pulled when cycling round won't (2,3)
I believe the answer is:
on tow
'being pulled' is the definition.
(I've seen this before)
'cycling round won't' is the wordplay.
'cycling' is an anagram indicator.
'round' becomes 'o' (round can mean a round object).
'o'+'wont'='owont'
'owont' is an anagram of 'ON TOW'.
'when' is the link.
(Other definitions for on tow that I've seen before include "being pulled by trucker?" , "Being pulled along" , "being strung along?" , "Being drawn" , "A caravan is usually" .)