Be agreeable to a sleep, perhaps (6)

I believe the answer is:

please

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

'be agreeable' is the definition.
I can't tell whether this definition defines the answer.

'a sleep perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'a'+'sleep'='asleep'
'asleep' is an anagram of 'PLEASE'.

'to' is the link.

Can you help me to learn more?

(Other definitions for please that I've seen before include "Cause to feel happy" , "Would you mind" , "Delight; amuse" , "Gratify as by a sleep" , "Give happiness" .)

I've seen this clue in The Irish News.

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