Details on sailor taken to onlooker (9)

I believe the answer is:

spectator

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'onlooker' is the definition.
(I've seen this before)

'details on sailor taken to' is the wordplay.
'details on' becomes 'spec' (I can't explain this - if you can you should believe this answer much more).
'sailor' becomes 'tar' (tar can mean a sailor).
'taken' indicates putting letters inside.
'tar' going around 'to' is 'tator'.
'spec'+'tator'='SPECTATOR'

Can you help me to learn more?

(Other definitions for spectator that I've seen before include "One watching a game" , "Periodical" , "member of the crowd" , "given weekly inspection?" , "fan" .)

I've seen this clue in The Daily Express.

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