Entertaining a thought (7)

I believe the answer is:

amusing

'entertaining' is the definition.
('amusing' can be similar in meaning to 'entertaining')

'a thought' is the wordplay.
'thought' becomes 'musing' (musing is a kind of thought).
'a'+'musing'='AMUSING'

(Other definitions for amusing that I've seen before include "Killing" , "Entertaining in a mild way" , "might be funny" , "Mildly funny - diverting" , "Pleasantly diverting" .)

I've seen this clue in The Telegraph.

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