Corporation getting billions after introducing hard part of glove (5)
I believe the answer is:
thumb
'part of glove' is the definition.
'thumb' can be an answer for 'part' (thumb is a kind of part). I'm not certain of the 'of glove' bit.
'corporation getting billions after introducing hard' is the wordplay.
'corporation getting' becomes 'tum' (I can't justify this - if you can you should believe this answer much more).
'billions' becomes 'b' (abbreviation).
'after' means one lot of letters go next to another.
'introducing' indicates putting letters inside (some letters introduced or inserted into others).
'hard' becomes 'h' (abbreviation used in pencil classifications).
'tum'+'b'='tumb'
'tumb' enclosing 'h' is 'THUMB'.
Can you help me to learn more?
(Other definitions for thumb that I've seen before include "One opposed to other manual workers" , "Hitch ride" , "Tom's digit" , "''Tom ..., the piper's son'' (nursery rhyme)" , "Digit (used for making a hitch?)" .)