Suspect type of card set up with credit (8)
I believe the answer is:
mistrust
'suspect' is the definition.
(synonyms)
'type of card set up with credit' is the wordplay.
'type of card' becomes 'sim' (SIM cards are used in mobile phones).
'set up' is a reversal indicator.
'with' says to put letters next to each other.
'credit' becomes 'trust' (trust is a kind of credit).
'sim' backwards is 'mis'.
'mis'+'trust'='MISTRUST'
(Other definitions for mistrust that I've seen before include "Have doubts about" , "Have no confidence in (someone)" , "reservations" , "Regard with suspicion" , "Lack of belief (in someone)" .)