Crossword Genius

His hobby has a set purpose (9)

Ross

I believe the answer is:

collector

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This could be a double definition.

'his hobby has a' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'set purpose' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for collector that I've seen before include "Accunulator, gatherer" , "One who accumulates things" , "Accumulator, gatherer" , "Acquirer of antiques, taxes, etc" , "One who likes to amass things" .)

I've seen this clue in The Globe and Mail.
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