Front line summits of Sabalan, Oshtorankuh, Bazman, Alam-Kuh in Iran (6)

I believe the answer is:

isobar

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'front line' is the definition.
(I've seen this in another clue)

'summits of sabalan oshtorankuh bazman alam-kuh in iran' is the wordplay.
'summits of' indicates taking the first letters (I've seen 'summit of' mean this).
'alam-kuh' becomes 'a' (this might be a standard abbreviation of which I'm unaware).
'in' indicates putting letters inside.
'iran' becomes 'ir' (eg in website addresses).
The initial letters of 'sabalan oshtorankuh bazman' is 'sob'.
'sob'+'a'='soba'
'soba' put within 'ir' is 'ISOBAR'.

Can you help me to learn more?

(Other definitions for isobar that I've seen before include "Equal-pressure line" , "(Map) line of constant atmospheric pressure" , "As brio (anag)" , "A Boris (anag.)" , "Line on map showing atmospheric pressure" .)

I've seen this clue in The Irish Times.

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