Result of cutting about Greek pair raised by Henry? (8)

'result of cutting' is the definition.

'about greek pair raised by henry?' is the wordplay.
'about' means one lot of letters goes inside another.
'greek' becomes 'gr'.
'pair' becomes 'twoer' (I can't explain this - if you can you should give a lot more credence to this answer).
'raised by' says the letters should be written in reverse.
'henry?' becomes 'h' ('H' can be a synonym of 'henry').
'twoer' reversed gives 'reowt'.
'gr' put into 'reowt' is 'regrowt'.
'regrowt'+'h'='REGROWTH'