Likely to work with American consumed by strange beliefs (8)
I believe the answer is:
feasible
'likely to work' is the definition.
(I've seen this before)
'american consumed by strange beliefs' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'consumed by' is an insertion indicator.
'strange' is an anagram indicator.
'beliefs' is an anagram of 'fesible'.
'a' going into 'fesible' is 'FEASIBLE'.
'with' is the link.
(Other definitions for feasible that I've seen before include "not impossible" , "Practicable and possible" , "Base life (anag.)" , "workable" , "Easily possible to do" .)