Make stout for a teetotaller in bog? (6)
I believe the answer is:
fatten
'make stout' is the definition.
(I've seen this in another clue)
'a teetotaller in bog?' is the wordplay.
'teetotaller' becomes 'tt' (abbreviation).
'in' means one lot of letters goes inside another.
'bog?' becomes 'fen' (I've seen this in another clue).
'a'+'tt'='att'
'att' placed within 'fen' is 'FATTEN'.
'for' acts as a link.
(Other definitions for fatten that I've seen before include "Make plump" , "Make chubbier" .)