After half a month tropical vine is seen by Dutch queen (7)

'seen by dutch queen' is the definition.
The definition suggests a singular noun which matches the answer.

'after half a month tropical vine' is the wordplay.
'after' is a charade indicator (letters next to each other).
'half a' means to take half the letters.
'month' becomes 'june' (June is an example).
'tropical vine' becomes 'liana' (I've seen this before).
'june' halved is 'ju'.
'ju'+'liana' is 'JULIANA'.

'is' acts as a link.

Can you help me to learn more?