Learn GP is spreading something catching? (7)

I believe the answer is:

grapnel

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'something catching?' is the definition.
I can't judge whether this defines the answer.

'learn gp is spreading' is the wordplay.
'is spreading' indicates anagramming the letters.
'learn'+'gp'='learngp'
'learngp' anagrammed gives 'GRAPNEL'.

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(Other definitions for grapnel that I've seen before include "Hook on rope" , "Light anchor for small boats" , "Grasping implement" , "Rope/hook device" , "Grappling hook" .)

I've seen this clue in The Irish Times.

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