Always shows hesitation going to the back of the queue (3)
I believe the answer is:
eer
'always' is the definition.
(synonyms)
'hesitation going to the back of the queue' is the wordplay.
'hesitation' becomes 'er' (sound made while hesitating - um, er).
'going to' says to put letters next to each other.
'the back of the' indicates one should take the final letters.
The last letter of 'queue' is 'e'.
'er' after 'e' is 'EER'.
'shows' acts as a link.
(Other definitions for eer that I've seen before include "Ever poetically" , "Before, poetically speaking (1'2)" , "Always (poetic)" , "Always (poetical)" , "Ever to the poet (3)." .)