Extremist involved in awful tragedy (5)

I believe the answer is:

ultra

'extremist' is the definition.
(ultra can mean an extremist or radical)

'involved in awful tragedy' is the wordplay.
'involved in' indicates a hidden word.
'ULTRA' is hidden within 'awful tragedy'.

(Other definitions for ultra that I've seen before include "Prefix meaning beyond or excessively" , "Fanatic" , "holding extreme position" , "(As prefix) beyond or extreme" , "Far beyond the norm" .)

I've seen this clue in The Independent and The Sun.

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