He composed "Rule Britannia" from clear necessity (4)

I believe the answer is:

arne

'he composed rule britannia' is the definition.
(I've seen this in another clue)

'from clear necessity' is the wordplay.
'from' indicates a hidden word.
'ARNE' is hidden within 'clear necessity'.

(Other definitions for arne that I've seen before include "Rule Britannia's composer, d. 1778" , "Rule, Britannia author" , "Rule Britannia composer, d. 1778" , "Thomas --, composer of Rule, Britannia!" .)

I've seen this clue in the Evening Standard.

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