Try just a little lower (9)
I believe the answer is:
touchdown
'try' is the definition.
(I've seen this before)
'a little lower' is the wordplay.
'a little' becomes 'touch' (eg 'a little too big' means 'a touch too big').
'lower' becomes 'down' (synonyms).
'touch'+'down'='TOUCHDOWN'
'just' acts as a link.
(Other definitions for touchdown that I've seen before include "A score of six points in American football" , "land" , "Try for this" , "at end of flight" , "a score, with a chance for more?" .)