Engineer putting in a seal, strip of sticky material (10,4)
I believe the answer is:
insulating tape
'strip of sticky material' is the definition.
'insulating tape' can be an answer for 'strip' (insulating tape is a kind of strip). I am not certain of the 'of sticky material' bit.
'engineer putting in a seal' is the wordplay.
'engineer' is an anagram indicator.
'putting'+'in'+'a'+'seal'='puttinginaseal'
'puttinginaseal' anagrammed gives 'INSULATING TAPE'.
Can you help me to learn more?
(Other definitions for insulating tape that I've seen before include "binder?" , "Wrap for exposed electric wires" , "sticky strip" .)