Oddly, Spain doesn’t fancy the Rock (9)
I believe the answer is:
sandstone
'the rock' is the definition.
(sandstone is a kind of rock)
'oddly spain doesn't fancy' is the wordplay.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
'fancy' indicates anagramming the letters.
The alternate letters of 'spain' are 'san'.
'doesnt' anagrammed gives 'dstone'.
'san'+'dstone'='SANDSTONE'
(Other definitions for sandstone that I've seen before include "Rock containing quartz grains" , "Type of sedimentary rock" , "Such building material" , "Among the best of building materials" .)