Regretted having to strike set from tremendous production (7)

I believe the answer is:

mourned

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'regretted having to strike' is the definition.
I can't tell whether this defines the answer.

'set from tremendous production' is the wordplay.
'from' suggests deleting specific letters.
'production' is an anagram indicator.
'tremendous' with 'set' removed is 'rmendou'.
'rmendou' with letters rearranged gives 'MOURNED'.

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(Other definitions for mourned that I've seen before include "Grieved for, lamented" , "No demur about the late departed" , "Grieved, sorrowed" .)

I've seen this clue in The Irish Times.

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