Travel by Longford borders - there's something valuable there (4)
I believe the answer is:
gold
'something valuable there' is the definition.
I can't judge whether this defines the answer.
'travel by longford borders' is the wordplay.
'travel' becomes 'go' (synonyms).
'by' is a charade indicator (letters next to each other).
'borders' suggests removing the centre (only the edge or border letters remain).
'longford' with its middle taken out is 'ld'.
'go'+'ld'='GOLD'
'there's' acts as a link.
Can you help me to learn more?
(Other definitions for gold that I've seen before include "Colour of archery target's centre" , "Mine produces this" , "Element (Au)" , "bull's-eye" , "Thin sheet of precious metal" .)