Maybe the subjunctive in Low Dutch (4)
I believe the answer is:
mood
'maybe the subjunctive' is the definition.
I can't judge whether this defines the answer.
'low dutch' is the wordplay.
'low' becomes 'moo' (both can mean to make the noise of a cow).
'dutch' becomes 'd' (common abbreviation).
'moo'+'d'='MOOD'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for mood that I've seen before include "Disposition" , "Feeling of doom" , "Low spirits" , "State of mind or emotion" , "Emotional state" .)