Crossword Genius

Doctor on a ship - on the rocks perhaps (4)

Ross

I believe the answer is:

moss

I'm a little stuck... Click here to teach me more about this clue!

'the rocks perhaps' is the definition.
I can't judge whether this defines the answer.

'doctor on a ship' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'on' means one lot of letters go next to another.
'a ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'mo'+'ss'='MOSS'

'on' is the link.

Can you help me to learn more?

(Other definitions for moss that I've seen before include "Type of plant growing in damp places" , "material not in Rolling Stones' collection?" , "Veteran racing driver" , "Stirling or Kate?" , "Small plants growing as thick mat" .)

I've seen this clue in The Globe and Mail.
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