Crossword Genius

I'll be silent, stuck for an answer? (2,4,3,6)

Ross

I believe the answer is:

my lips are sealed

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

'i'll' is the definition.
I can't judge whether this definition defines the answer.

'be silent stuck for an answer?' is the wordplay.
I cannot really understand how this works, but
'be' could be 'are' (I've seen this in another clue) and 'are' is found within the answer.
'an' could be 'i' (Roman numeral for one) and 'i' is found in the answer.
'answer?' could be 'a' (abbreviation eg in Q and A) and 'a' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for my lips are sealed that I've seen before include "I can't say" , "I won't say a word" , "I'll keep mum" .)

I've seen this clue in The Guardian.
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