Beware a gang containing head of state (6)

I believe the answer is:

reagan

'head of state' is the definition.
(I've seen this before)

'beware a gang containing' is the wordplay.
'containing' says the answer is hidden in the clue.
'REAGAN' can be found hidden inside 'beware a gang'.

(Other definitions for reagan that I've seen before include "political leader" , "Ronald ..., ex-president of USA" , "Western star" , "US president nineteen eighty one to ninteen eighty nine" , "Actor seen in old movies" .)

I've seen this clue in The Mirror.

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