Crossword Genius

Spend a lot of time on sea trips (8)

Ross

I believe the answer is:

passages

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

'sea trips' is the definition.
The answer and definition can be both acts as well as being plural nouns.
Perhaps there's an association between them I don't understand?

'spend a lot of time on' is the wordplay.
'spend' becomes 'pass' (synonyms).
'a lot of time' becomes 'ages' (I've seen this in another clue).
'on' is a charade indicator (letters next to each other).
'pass'+'ages'='PASSAGES'

Can you help me to learn more?

(Other definitions for passages that I've seen before include "Paths between buildings" , "Narrow streets or routes" , "journeys" , "sections of the speech" , "Corridors, ways through" .)

I've seen this clue in the Evening Standard.
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