Row of mountains resounded with echo (5)
I believe the answer is:
range
'row of mountains' is the definition.
'range' can be an answer for 'mountains' (range of mountains). I am not sure about the 'row of' bit.
'resounded with echo' is the wordplay.
'resounded' becomes 'rang' ('ring' can be a synonym of 'resound').
'with' is a charade indicator (letters next to each other).
'echo' becomes 'e' (phonetic alphabet: alpha, bravo, charlie etc.).
'rang'+'e'='RANGE'
Can you help me to learn more?
(Other definitions for range that I've seen before include "cover a certain area" , "Set < compass" , "Where to cook" , "Selection" , "Scope (for target practice?)" .)