Dull, see, their plays (8)

I believe the answer is:

etherise

'dull' is the definition.
('dull'->'etherize' is in my internal thesaurus and 'ize'->'ise')

'see their plays' is the wordplay.
'plays' is an anagram indicator.
'see'+'their'='seetheir'
'seetheir' is an anagram of 'ETHERISE'.

(Another definition for etherise that I've seen is " Put out".)

I've seen this clue in The Times.

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