Provide a service protecting concepts (5)
I believe the answer is:
ideas
'concepts' is the definition.
(I've seen this before)
'provide a service protecting' is the wordplay.
'protecting' says the answer is hidden in the clue.
'IDEAS' is hidden within 'provide a service'.
(Other definitions for ideas that I've seen before include "Thoughts, concepts" , "Brain waves" , "Thoughts, creative perhaps" , "Thoughts or opinions" , "Notions, thoughts" .)