What's funny about strange percussive sound (4,4)

I believe the answer is:

drum roll

I'm a little stuck... Click here to teach me more about this clue!

'percussive sound' is the definition.
'drum roll' can be an answer for 'sound' (drum roll is a kind of sound). I am not sure about the 'percussive' bit.

'what's funny about strange' is the wordplay.
'what's funny' becomes 'droll' (droll means dryly amusing).
'about' means one lot of letters goes inside another.
'strange' becomes 'rum' (synonyms).
'droll' enclosing 'rum' is 'DRUM ROLL'.

Can you help me to learn more?

(Other definitions for drum roll that I've seen before include "Haydn symphony" , "Tattoo" , "Rapid percussive sound" , "musical introduction?" .)

I've seen this clue in The Times.

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