Crossword Genius

Twelve hang out in gap between peaks? (10)

Ross

I believe the answer is:

wavelength

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

'gap between peaks?' is the definition.
I can't tell whether this defines the answer.

'twelve hang out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'twelve'+'hang'='twelvehang'
'twelvehang' anagrammed gives 'WAVELENGTH'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for wavelength that I've seen before include "Identification of radio station" , "surfers may maximise use of?" , "Property of radio signal, light, etc" .)

I've seen this clue in The Times.
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