Temporarily put up shelter in school with parking (4)

I believe the answer is:

gamp

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'temporarily put up shelter' is the definition.
I can't tell whether this definition defines the answer.

'school with parking' is the wordplay.
'school' becomes 'gam' (both can refer to a group of whales).
'with' says to put letters next to each other.
'parking' becomes 'p' (abbreviation on road signs).
'gam'+'p'='GAMP'

'in' is the link.

Can you help me to learn more?

(Other definitions for gamp that I've seen before include "Umbrella (from Dickens character)" , "Waterproof cover" , "Midwife" , "Umbrella (inf)" .)

I've seen this clue in The Times.

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