Crossword Genius

Bad loser, guy I've detailed in deplorable fashion (10)

Ross

I believe the answer is:

grievously

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

'bad loser guy i've detailed in deplorable fashion' is the definition.
I can't judge whether this defines the answer.

'bad loser guy i've detailed' is the wordplay.
'bad' is an anagram indicator.
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'loser'+'guy'+'ive'='loserguyive'
'loserguyive' with its final letter taken off is 'loserguyiv'.
'loserguyiv' with letters rearranged gives 'GRIEVOUSLY'.

Can you help me to learn more?

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app