Some insects drop right into your cuppa (7)
I believe the answer is:
diptera
'some insects' is the definition.
(I've seen this before)
'drop right into your cuppa' is the wordplay.
'drop' says to take the initial letters (I've seen 'drop of' mean this).
'into' indicates putting letters inside.
'your' becomes 'dip' (I am not sure about this - if you are sure you should believe this answer much more).
'cuppa' becomes 'tea' (informal term for a cup of tea).
The first letter of 'right' is 'r'.
'dip'+'tea'='diptea'
'r' going within 'diptea' is 'DIPTERA'.
Can you help me to learn more?
(Other definitions for diptera that I've seen before include "Flies" , "Flighty little types" , "Insects" .)