Crossword Genius

Guard post under inspection (9)

Ross

I believe the answer is:

lookafter

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'inspection' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'guard post under' is the wordplay.
'guard' becomes 'look' (I am not sure about this - if you are sure you should believe this answer much more).
'post' becomes 'after' (the prefix 'post-' means 'after').
'under' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'look'+'after'='LOOKAFTER'

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I've seen this clue in The Daily Express.
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