A reason for current stoppage by paragon of industry in firm (7)

I believe the answer is:

adamant

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'firm' is the definition.
(adamant can mean firm or determined)

I don't understand the rest of the clue.

(Other definitions for adamant that I've seen before include "6a [PRINCESS IDA] 's fortress < for unyielding" , "Unswerving" , "Unshakable (in an opinion)" , "Insistent, inflexible" , "Firm and unyielding" .)

I've seen this clue in The Times.

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