Girl taking jet to see old stamp (5,5)
I believe the answer is:
penny black
'see old stamp' is the definition.
The definition suggests a singular noun which matches the answer.
'girl taking jet' is the wordplay.
'girl' becomes 'penny' (woman's name).
'taking' is a charade indicator (letters next to each other).
'jet' becomes 'black' (similar in meaning).
'penny'+'black'='PENNY BLACK'
'to' is the link.
Can you help me to learn more?
(Other definitions for penny black that I've seen before include "World's first adhesive postage stamp, 1840" , "first to get licked" , "when without means to send a letter" , "Today one would be unlikely to lick this" .)