thanks for your query.
I think better to consult to your doctor.
Clearish fluid from nose following trauma may be due to CSF leak (CSF rhinorhoea)
past h/o sinus surgery
and recent trauma leads to increased chances of damage to base skull and CSF Leak.
But dont worry as it is in resolving phase, as you are not having fluid anymore.
But IT needs to be evaluated and treated.
Many thanks, take care.