Man has a dig to get round plant (9)
I believe the answer is:
tomatillo
'plant' is the definition.
(tomatillo is a kind of plant)
'man has a dig to get round' is the wordplay.
'man has' becomes 'toma' (I can't explain this - if you can you should give a lot more credence to this answer).
'a dig' becomes 'till' (I've seen this before).
'to get' means one lot of letters go next to another.
'round' becomes 'o' (round can mean a round object).
'toma'+'till'+'o'='TOMATILLO'
(Other definitions for tomatillo that I've seen before include "Green fruit" , "fruit in Mexico" , "Mexican food" , "plant" .)