Slightly disturbed at a master attending seedy show, indeed (2,1,6,2,4)
I believe the answer is:
as a matter of fact
'slightly' is the definition.
Both the answer and definition are adverbs. Maybe you can see a link between them that I can't see?
'disturbed at a master attending seedy show indeed' is the wordplay.
I cannot quite understand how this works, but
'at' is present in the answer.
'a' is present in the answer.
an anagram of 'master' is 'samter' which is present in the left over letters.
'show' could be 'act' (act is a kind of show) and 'act' is found within the answer.
The remaining letters 'off' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for as a matter of fact that I've seen before include "in reality" , "Actually" .)