Again make an estimation re the idiots on first station (8)
I believe the answer is:
reassess
'again' is the definition.
(I've seen this before)
're the idiots on first station' is the wordplay.
'the idiots' becomes 'asses' (I've seen this before).
'on' means one lot of letters go next to another.
'first station' becomes 's' (1st letter of 'station').
're'+'asses'+'s'='REASSESS'
'make an estimation' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for reassess that I've seen before include "Have second thoughts" , "Estimate value once more" , "Rate afresh" , "Test again" , "size up again" .)