Uncompromising and concerning, like Lewis on eponymous TV series (11)
I believe the answer is:
remorseless
'uncompromising' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?
'concerning like lewis on eponymous tv series' is the wordplay.
I cannot quite see how this works, but
'concerning' could be 're' (both can mean on a particular topic) and 're' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'and' acts as a link.
Can you help me to learn more?
(Other definitions for remorseless that I've seen before include "Implacable" , "Relentless" , "Cruel; without respite" , "Without regret or guilt" , "Not letting up," .)