Crossword Genius

Fitting end for a number with no heart (5)

Ross

I believe the answer is:

tenon

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

'fitting end' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'number with no heart' is the wordplay.
'number with' becomes 'ten' (ten is a kind of whole number. I am not sure about the 'with' bit.).
'no' becomes 'none' (I've seen this before).
'heart' means to look at the middle letters.
The middle letters of 'none' are 'on'.
'ten'+'on'='TENON'

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for tenon that I've seen before include "Joint - tonne (anag)" , "Tongue of wood for joint" , "Piece of wood that fits into a mortise" , "Part of a wooden joint" , "Tongue of wood, fits into mortise" .)

I've seen this clue in The Globe and Mail.
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