Love to bother engineers (5)
I believe the answer is:
adore
'love' is the definition.
(adoring is a kind of loving)
'bother engineers' is the wordplay.
'bother' becomes 'ado' (both can mean fuss or commotion).
'engineers' becomes 're' (abbreviation for Royal Engineers).
'ado'+'re'='ADORE'
'to' is the link.
(Other definitions for adore that I've seen before include "Cherish" , "Honour" , "Love greatly" , "Respect deeply" , "Treasure" .)