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' means one lot of letters go next to another.
'half a' suggests halving the letters.
'month' becomes 'july' (July is an example).
'tropical vine' becomes 'liana' (I've seen this before).
'july' cut in half is 'ju'.
'ju' put next to 'liana' is 'JULIANA'.

'is' is the link.

Can you help me to learn more?