G&S princess has years away, very probably! (1,7)

I believe the answer is:

i daresay

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'very probably' is the definition.
(phrase used to introduce a prediction or claim)

'gs princess has years away' is the wordplay.
'gs princess' becomes 'ida' (I can't justify this - if you can you should believe this answer much more).
'has' means one lot of letters go next to another.
'away' indicates an anagram (letters move away from their original places).
'years' with letters rearranged gives 'resay'.
'ida'+'resay'='I DARESAY'

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(Other definitions for i daresay that I've seen before include "Maybe" , "Methinks it's likely that" , "Probably" .)

I've seen this clue in The Times.

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