Commercial vehicle going over Scotland emptied site in Faslane say (5,4)

I believe the answer is:

naval base

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

'faslane say' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'commercial vehicle going over scotland emptied site' is the wordplay.
'commercial vehicle' becomes 'van' (I've seen this before).
'going over' says the letters should be written backwards.
'scotland' becomes 'Alba' (Gaelic name for Scotland).
'emptied' suggests removing the centre.
'site' with its centre taken out is 'se'.
'van' written backwards gives 'nav'.
'nav'+'alba'+'se'='NAVAL BASE'

'in' acts as a link.

Can you help me to learn more?

(Another definition for naval base that I've seen is " For example, Norfolk, Va or Portsmouth, Hants".)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app