Suggested golf teacher sat for his picture (8)
I believe the answer is:
proposed
'suggested' is the definition.
('propose' can be a synonym of 'suggest')
'golf teacher sat for his picture' is the wordplay.
I cannot really understand how this works, but
'sat' could be 'posed' ('pose' can be a synonym of 'sit') and 'posed' is present in the answer.
'for' could be 'pro' (as in being 'pro' something) and 'pro' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for proposed that I've seen before include "Advocated" , "Moved" , "Suggested" , "Nominated, put forward for consideration" , "Presented for consideration" .)