Increase the wealth of Henri Charrière, somewhat (6)
I believe the answer is:
enrich
'increase' is the definition.
(I know that enrich is a more specific form of add)
'of henri charriere somewhat' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'ENRICH' is hidden in the letters of 'of henri charriere'.
'the wealth' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for enrich that I've seen before include "Improve the quality by adding things" , "Add to and improve" , "Heighten" , "Adorn, enhance or make wealthy" , "Make wealthy or improve the quality" .)