People desperate to photograph sailor turning up on deck (7)

I believe the answer is:

ratpack

'people desperate to photograph' is the definition.
(informal term for press photographers)

'sailor turning up on deck' is the wordplay.
'sailor' becomes 'tar' (tar is a kind of sailor).
'turning up' says the letters should be written backwards.
'on' is a charade indicator (letters next to each other).
'deck' becomes 'pack'.
'tar' written backwards gives 'rat'.
'rat'+'pack'='RATPACK'

(Another definition for ratpack that I've seen is " Paparazzi as a group".)

I've seen this clue in The Independent.

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