Remember to get engineers on phone (6)
I believe the answer is:
recall
'remember' is the definition.
('recall' can be a synonym of 'remember')
'engineers on phone' is the wordplay.
'engineers' becomes 're' (Royal Engineers).
'on' is a charade indicator (letters next to each other).
'phone' becomes 'call' ('call' can be a synonym of 'phone'**).
're'+'call'='RECALL'
'to get' is the link.
(Other definitions for recall that I've seen before include "Summon back or bring to mind" , "Summon back as to memory" , "Get back" , "Order to return" , "Summon back, perhaps to mind" .)