Absorbed strange need to keep entire amount (9)
I believe the answer is:
engrossed
'absorbed' is the definition.
('engross' can be a synonym of 'absorb')
'strange need to keep entire amount' is the wordplay.
'strange' indicates anagramming the letters.
'to keep' indicates putting letters inside.
'entire amount' becomes 'gross' (gross is a kind of amount. I am not sure about the 'entire' bit.).
'need' is an anagram of 'ened'.
'ened' placed around 'gross' is 'ENGROSSED'.
Can you help me to learn more?
(Other definitions for engrossed that I've seen before include "Gripped" , "Preoccupied" , "occupied" , "Captive" , "Deeply engaged" .)