Edgar's about to guard the Spanish composer (6,5)

I believe the answer is:

edward elgar

'composer' is the definition.
(I know that Edward Elgar has the occupation composer)

'edgar's about to guard the spanish' is the wordplay.
'about' indicates putting letters inside.
'to guard' becomes 'ward' (synonyms).
'the spanish' becomes 'el' ('the' in Spanish).
'ward'+'el'='wardel'
'edgar' enclosing 'wardel' is 'EDWARD ELGAR'.

(Another definition for edward elgar that I've seen is " British composer of "Enigma Variations"".)

I've seen this clue in the Sydney Morning Herald.

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