Crossword Genius

Post Office counter and safe to be put away (7)

Ross

I believe the answer is:

potable

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

'safe to be put away' is the definition.
I can't tell whether this defines the answer.

'post office counter' is the wordplay.
'post office' becomes 'po' (abbreviation).
'counter' becomes 'table' (I've seen this before).
'po'+'table'='POTABLE'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for potable that I've seen before include "fit to ingest" , "Fit to drink" , "may be drunk" , "having healthy water quality" , "Fit for drinking" .)

I've seen this clue in The Sunday Times and The Times.
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