Wrench small one taken from cycle bag (7)
I believe the answer is:
spanner
'wrench' is the definition.
(I know that wrench can be written as spanner)
'small one taken from cycle bag' is the wordplay.
I cannot quite understand how this works, but
'small' could be 's' (abbreviation - e.g. clothes size) and 's' is found in the answer.
'one' could be 'er' (I've seen this in other clues) and 'er' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for spanner that I've seen before include "Hand tool to hold or twist" , "Tool for tightening or loosening" , "Wrench for nuts" , "that might cause difficulty in the works" , "Tool, often adjustable" .)