Offended tramp picked up in complex (8)

I believe the answer is:

syndrome

I'm a little stuck... Click here to teach me more about this clue!

'complex' is the definition.
(syndrome is a kind of complex)

I cannot understand how the remainder of the clue works.

(Other definitions for syndrome that I've seen before include "behaviour pattern ..." , "Set of symptoms indicating abnormal conditions" , "Set of symptoms usually occurring together" , "Characteristic group of symptoms" , "Combination of symptoms" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app