Tip from left-wing boards incenses line managers (7)
I believe the answer is:
anglers
'line managers' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps you can see a link between them that I don't see?
'tip from left-wing boards incenses' is the wordplay.
'tip from left wing' becomes 'l' (I can't justify this - if you can you should believe this answer much more).
'boards' means one lot of letters goes inside another.
'incenses' becomes 'angers' (I've seen this in another clue).
'l' placed inside 'angers' is 'ANGLERS'.
Can you help me to learn more?
(Other definitions for anglers that I've seen before include "People fishing" , "Fishermen" .)