Crossword Genius

Later the beam will be split by axe, finally (10)

Ross

I believe the answer is:

thereafter

'later' is the definition.
(I've seen this before)

'the beam will be split by axe finally' is the wordplay.
'beam' becomes 'rafter' (rafter is a kind of beam).
'will be split by' is an insertion indicator (some letters split a word into two).
'finally' suggests the final letters.
The last letter of 'axe' is 'e'.
'rafter' enclosing 'e' is 'reafter'.
'the'+'reafter'='THEREAFTER'

(Other definitions for thereafter that I've seen before include "Following that time" , "Next" , "Subsequently" , "later" .)

I've seen this clue in The Times.
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