Serving as a warning about Tirana, you suspect (10)

I believe the answer is:

cautionary

'serving as a warning' is the definition.
(as in a cautionary tale)

'about tirana you suspect' is the wordplay.
'about' becomes 'c' (circa).
'suspect' indicates anagramming the letters (a suspicious or unusual spelling).
'tirana'+'you'='tiranayou'
'tiranayou' anagrammed gives 'autionary'.
'c'+'autionary'='CAUTIONARY'

(Another definition for cautionary that I've seen is " Serving to warn".)

I've seen this clue in The Telegraph.

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