Nothing in film can make you tearful (5)
I believe the answer is:
moist
'tearful' is the definition.
(I've seen this in another clue)
'nothing in film' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'in' means one lot of letters goes inside another.
'film' becomes 'mist' (to film over is to mist or fog over).
'o' placed inside 'mist' is 'MOIST'.
'can make you' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for moist that I've seen before include "Affected by tears, perhaps" , "sloppy" , "Damp or clammy" , "bit wet" , "Damp, humid" .)