See below stall (10)
I believe the answer is:
understand
'see' is the definition.
(synonyms)
'below stall' is the wordplay.
'below' becomes 'under' (synonyms).
'stall' becomes 'stand' (synonyms).
'under'+'stand'='UNDERSTAND'
(Other definitions for understand that I've seen before include "Make sense of" , "Dig" , "Twig" , "See" , "Grasp - sympathise" .)