Crossword Genius

Sailor in action regularly dropped off here? (5)

Ross

I believe the answer is:

cabin

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'dropped off here?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'sailor in action regularly' is the wordplay.
'sailor' becomes 'ab' (abbreviation for able seaman).
'in' indicates putting letters inside.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'action' are 'cin'.
'ab' going inside 'cin' is 'CABIN'.

Can you help me to learn more?

(Other definitions for cabin that I've seen before include "Building" , "Small room or hut" , "Small house (built of logs?)" , "Wooden shack" , "Wooden house" .)

I've seen this clue in The Guardian.
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