Strikes a heavy blow, interrupting set I'm singing up here (6)

I believe the answer is:

smites

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'strikes' is the definition.
(I've seen this before)

'a heavy blow interrupting set i'm singing up here' is the wordplay.
'SMITES' is hidden backwards within the letters.
However, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for smites that I've seen before include "Strikes heavily or kills, biblical word" , "biblical hits" , "Deals a heavy blow" .)

I've seen this clue in The Irish Times.

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