Crossword Genius

Hobbyist, one with a very full passport? (5,9)

Ross

I believe the answer is:

stamp collector

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

'full passport?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'hobbyist one with a very' is the wordplay.
'hobbyist' becomes 'collector'.
'one with' says to put letters next to each other.
'a very' becomes 'stamp' (I am not sure about this - if you are sure you should believe this answer much more).
'collector' put after 'stamp' is 'STAMP-COLLECTOR'.

Can you help me to learn more?

(Other definitions for stamp collector that I've seen before include "Philatelist" , "one makes albums" .)

I've seen this clue in The Telegraph.
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