Three worked on my back — one might be bowed, for example (9)
I believe the answer is:
heteronym
'one might be bowed for example' is the definition.
(the word 'bowed' is a heteronym)
'three worked on my back' is the wordplay.
'worked' indicates anagramming the letters.
'back' says the letters should be written backwards.
'my' written backwards gives 'ym'.
'three' anagrammed gives 'heter'.
'heter'+'on'+'ym'='HETERONYM'
(Other definitions for heteronym that I've seen before include "lead, say" , "[DOES] , for example" .)