Perhaps schooner's given to boss filled with whiskey (3-6)

I believe the answer is:

two-master

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'perhaps schooner's' is the definition.
I can't tell whether this defines the answer.

'to boss filled with whiskey' is the wordplay.
'boss' becomes 'master' (I have seen 'The boss' mean 'master' so perhaps 'boss' could also mean 'master').
'filled with' is an insertion indicator.
'whiskey' becomes 'W' (alpha bravo charlie delta ...).
'to'+'master'='tomaster'
'tomaster' placed around 'w' is 'TWO-MASTER'.

'given' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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