Crossword Genius

Better that wool is ordered for warmth in retirement? (3-5,6)

Ross

I believe the answer is:

hot-water bottle

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

'warmth in retirement?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'better that wool is ordered' is the wordplay.
'is ordered' indicates anagramming the letters.
'better'+'that'+'wool'='betterthatwool'
'betterthatwool' is an anagram of 'HOT-WATER BOTTLE'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for hot-water bottle that I've seen before include "comfort in retirement!" , "Bed warmer" , "night heater" .)

I've seen this clue in The Independent.
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