Simple part of the Sea Symphony (4)

I believe the answer is:

easy

'simple' is the definition.
(similar in meaning)

'part of the sea symphony' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'EASY' can be found hidden inside 'sea symphony'.

(Other definitions for easy that I've seen before include "Comfortable" , "Like a walk in the park?" , "Frederick Marryat's midshipman" , "Simple or uncomplicated" , "Not rocket science" .)

I've seen this clue in The Irish Independent.

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