One who endorses roasting absurd play's conclusion (9)

I believe the answer is:

signatory

'one who endorses' is the definition.
(as in the signatory of a petition)

'roasting absurd play's conclusion' is the wordplay.
'absurd' is an anagram indicator.
'conclusion' says to take the final letters.
The final letter of 'play' is 'y'.
'roasting' is an anagram of 'signator'.
'signator'+'y'='SIGNATORY'

(Another definition for signatory that I've seen is " one in agreement".)

I've seen this clue in The Times.

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