Crossword Genius

Map line giving us a wintry promenade (4,5)

Ross

I believe the answer is:

cold front

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

'map line' is the definition.
The answer and definition can be both types of natural phenomena as well as being singular nouns.
Maybe there's an association between them I don't understand?

'a wintry promenade' is the wordplay.
'a wintry' becomes 'cold' (I've seen this in another clue).
'promenade' becomes 'front' (sea front).
'cold'+'front'='COLD FRONT'

'giving us' is the link.

Can you help me to learn more?

(Other definitions for cold front that I've seen before include "Meteorological boundary" , "which might change the weather" , "freeze?" , "that might bring on a chill" , "sometimes a feature of weather forecast" .)

I've seen this clue in the Evening Standard.
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