Worked at the wheel for a stretch (4)
I believe the answer is:
span
'stretch' is the definition.
(I've seen this in another clue)
'worked at the wheel for a' is the wordplay.
'worked at' becomes 'ps' (I can't justify this - if you can you should give a lot more credence to this answer).
'the wheel' says the letters should be written backwards (I've seen 'wheels' mean this (to wheel can mean to turn around)).
'for' means one lot of letters go next to another.
'a' becomes 'an'.
'ps' backwards is 'sp'.
'sp'+'an'='SPAN'
Can you help me to learn more?
(Other definitions for span that I've seen before include "Bridge or range" , "Part of bridge, nine inches" , "Ox team; bridge" , "Extent of aircraft's wing" , "Measurement between tips of thumb, little finger" .)