Incompetent samurai gets the heave-ho (10)
I believe the answer is:
amateurish
'incompetent' is the definition.
(I've seen this before)
'samurai gets the heave-ho' is the wordplay.
I cannot quite understand how this works, but
'gets' could be 'is' (I've seen this in other clues) and 'is' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for amateurish that I've seen before include "using little craft, perhaps" , "incompetent" , "Rather 31 across" , "Inept, unskilful" , "done imperfectly" .)