Crossword Genius

Look round posh home for creature under shell (3,6)

Ross

I believe the answer is:

sea-urchin

'creature under shell' is the definition.
(type of sea creature with a shell)

'look round posh home' is the wordplay.
'look' becomes 'search' (synonyms).
'round' indicates putting letters inside.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'home' becomes 'in' ('he's home' can mean 'he's in').
'search' enclosing 'u' is 'seaurch'.
'seaurch'+'in'='SEA-URCHIN'

'for' acts as a link.

I've seen this clue in The Telegraph.
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