Tigers blew up railway office (8)
I believe the answer is:
registry
'office' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'tigers blew up railway' is the wordplay.
'blew up' indicates an anagram (I've seen 'blow up' mean this).
'railway' becomes 'ry' (abbreviation for railway).
'tigers' is an anagram of 'regist'.
'regist'+'ry'='REGISTRY'
Can you help me to learn more?
(Other definitions for registry that I've seen before include "Place where recorded list is kept" , "Office where records are kept" , "Place where written documents or records are kept" , "where files may be observed" , "Place to keep records" .)