Wrench one out of small motorbike bag (7)
I believe the answer is:
spanner
'wrench' is the definition.
(I know that wrench can be written as spanner)
'one out of small motorbike bag' is the wordplay.
I cannot really understand how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is located in the answer.
'small' could be 's' (abbreviation - e.g. clothes size) and 's' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for spanner that I've seen before include "Nut tightener" , "Tool for fastening nuts" , "Tool for tightening or loosening" , "In the works, it's disruptive" , "In the works, this tool is a headache" .)