Reliable type of souvenir from Blackpool? (4)
I believe the answer is:
rock
I believe this is a double definition.
'reliable type' is the first definition.
(a rock is a reliable person)
'souvenir from blackpool?' is the second definition.
(Blackpool rock is a type of confectionery)
'of' is the link.
(Other definitions for rock that I've seen before include "Seaside confectionery" , "Modern music with a heavy beat" , "Reel from" , "Be unstable; lull (baby)" , "Big stone - music" .)