Some approval ideologically sound (5)

I believe the answer is:

valid

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

'some approval ideologically' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'VALID' is hidden in the letters of 'approval ideologically'.

(Other definitions for valid that I've seen before include "Legitimate" , "Sound, well-based" , "Legal, authentic" , "Effectual" , "Well-founded" .)

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

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