Crossword Genius

Use the rat-run possibly, making journey with a purpose (8,4)

Ross

I believe the answer is:

treasure hunt

'journey with a purpose' is the definition.
(journey to find treasure)

'use the rat-run possibly' is the wordplay.
'possibly' indicates an anagram.
'use'+'the'+'rat'+'run'='usetheratrun'
'usetheratrun' with letters rearranged gives 'TREASURE HUNT'.

'making' acts as a link.

(Other definitions for treasure hunt that I've seen before include "Game where players try to find things by following a series of clues" , "Game searching for hidden objects" , "Children's party game where things are sought" , "Game in which players search for hidden objects by following a trail of clues" , "Search conducted at children's birthday parties" .)

I've seen this clue in The Telegraph.
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