Using many words and images, keeping part mostly concealed (6)
I believe the answer is:
prolix
'using many words' is the definition.
(I've seen this before)
'images keeping part mostly concealed' is the wordplay.
'images keeping' becomes 'pix' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'part' becomes 'role' (eg a theatrical role).
'mostly' means to remove the last letter.
'concealed' indicates putting letters inside.
'role' with its last letter taken away is 'rol'.
'pix' enclosing 'rol' is 'PROLIX'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for prolix that I've seen before include "Tediously wordy and lengthy" , "Long and wordy" , "Tediously verbose" , "Wordy, long-winded" , "going on and on" .)