Stodge at the bottom, reason for stirring (7)
I believe the answer is:
emotive
'stirring' is the definition.
(I've seen this in another clue)
'stodge at the bottom reason' is the wordplay.
'at the bottom' suggests the final letters.
'reason' becomes 'motive' (I've seen this in another clue).
The final letter of 'stodge' is 'e'.
'e'+'motive'='EMOTIVE'
'for' is the link.
(Other definitions for emotive that I've seen before include "able to get going" , "Move tie (anag)" , "Eliciting intense feeling" , "Moving - controversial" , "Arousing great feeling" .)