Hating regular deep examination of gin cocktail (9)

I believe the answer is:

detesting

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

'hating' is the definition.
('detest' can be a synonym of 'hate')

'regular deep examination of gin cocktail' is the wordplay.
'regular' indicates alternate letters.
'examination of gin cocktail' becomes 'testing' (I can't justify this - if you can you should give a lot more credence to this answer).
The alternating letters of 'deep' are 'de'.
'de'+'testing'='DETESTING'

Can you help me to learn more?

(Another definition for detesting that I've seen is " Loathing".)

I've seen this clue in The Hindu.

Want a hint initially instead of a full solution? Install my app