Carry child on back of bike (4)
I believe the answer is:
tote
'carry' is the definition.
(I know that tote is a kind of carry)
'child on back of bike' is the wordplay.
'child' becomes 'tot' (term for a young child).
'on' says to put letters next to each other.
'back of' indicates one should take the final letters.
The last letter of 'bike' is 'e'.
'tot'+'e'='TOTE'
(Other definitions for tote that I've seen before include "move" , "Carry to the betting machine" , "holdall" , "system for betters" , "record of stakeholders' investments" .)