Stop corrosion with Fowler's first-rate sealant (9)

I believe the answer is:

frustrate

I'm a little stuck... Click here to teach me more about this clue!

'stop' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for frustrate that I've seen before include "Prevent from progressing" , "Prevent (plan) from being fulfilled" , "Thwart or baffle" , "'Thwart, disappoint (9)'" , "Put a stop to" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app