First of girls one's met when dancing -- Ruby or Beryl? (8)
I believe the answer is:
gemstone
'beryl?' is the definition.
(beryl is a kind of gemstone)
'first of girls one's met when dancing' is the wordplay.
'first of girls' becomes 'g' (1st letter of 'girls').
'when dancing' is an anagram indicator (letters dance around).
'ones'+'met'='onesmet'
'onesmet' with letters rearranged gives 'emstone'.
'g'+'emstone'='GEMSTONE'
'ruby or' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for gemstone that I've seen before include "It's considered precious" , "[RUBY] , for example" , "Emerald or ruby" , "Eg, sapphire" , "something of great value" .)