Out West, a boozer can be a studious type (4)
I believe the answer is:
swot
'a studious type' is the definition.
(I've seen this before)
'out west a boozer' is the wordplay.
I cannot quite understand how this works, but
'west' could be 'w' (abbreviation) and 'w' is found within the answer.
'boozer' could be 'sot' (both can mean someone who drinks a lot) and 'sot' is found in the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'can be' is the link.
Can you help me to learn more?
(Other definitions for swot that I've seen before include "Nerd" , "Very studious person" , "Intensive studier" , "One studying too much" , "Informally, one who studies hard" .)