Adamant it's unpalatable replacing Davey maybe with Cable (10)
I believe the answer is:
inflexible
'adamant' is the definition.
(similar in meaning)
'it's unpalatable replacing davey maybe with cable' is the wordplay.
I cannot really see how this works, but
'cable' could be 'flex' (type of flexible electric cable) and 'flex' is located in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for inflexible that I've seen before include "Firm" , "Stiff - obstinate" .)