Dew, we hear, is only to be expected (3)

I believe the answer is:

due

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'be expected' is the definition.
(similar in meaning)

'dew we hear' is the wordplay.
'we hear' indicates a 'sounds like' (homophone) clue.
'dew' sounds like 'DUE'.

'is only to' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for due that I've seen before include "Required; proper" , "Deserved or unpaid" , "...more than one there [ROME]" , "Appropriate - fee - requiring payment" , "Requisite" .)

I've seen this clue in the Evening Standard.

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