Fix hose by grass (5,4)
I believe the answer is:
tight spot
'fix' is the definition.
(I've seen this before)
'hose by grass' is the wordplay.
'hose' becomes 'tights' (synonyms).
'by' says to put letters next to each other.
'grass' becomes 'pot' (cannabis).
'tights'+'pot'='TIGHT SPOT'
(Other definitions for tight spot that I've seen before include "predicament" , "hole" , "Difficult situation" , "Fix" .)