。
Let me pay you back for it.
Literal
Reimburse-[causative-させ]-give-me-[rough imperative-くれ] [assertion-よ].
~させてくれ is the rough imperative of ~させてくれる ('let me do X,' literally 'give me the causative of doing X'). It requests permission to do something, in this case to compensate. 弁償する ('compensate, make restitution') is used for physical damage or financial loss. The rough ~くれ + よ gives it a familiar, almost gruff tone — typically spoken by a man to a peer.