Incorporating art, working sappers produce replacement components (5,5)
I believe the answer is:
spare parts
'replacement components' is the definition.
(I've seen this before)
'incorporating art working sappers' is the wordplay.
I cannot quite understand how this works, but
'art' could be 'part' (part is a kind of art) and 'part' is found in the answer.
'sappers' could be 're' (nickname for the Royal Engineers) and 're' is found within the answer.
The remaining letters 'spas' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'produce' is the link.
Can you help me to learn more?
(Other definitions for spare parts that I've seen before include "accessories" , "Pare straps (anag.)" , "such may effect repair" , "Don't be merciless on everything" , "Replacement components" .)