Tense coach beset by second journalist (8)
I believe the answer is:
strained
'tense' is the definition.
('strained' can be similar in meaning to 'tense')
'coach beset by second journalist' is the wordplay.
'coach' becomes 'train' ('train' can be a synonym of 'coach').
'beset by' is an insertion indicator ('beset' could historically mean 'cover').
'second' becomes 's' (common abbreviation).
'journalist' becomes 'ed' (short for editor).
's'+'ed'='sed'
'train' placed into 'sed' is 'STRAINED'.
(Other definitions for strained that I've seen before include "Not relaxed; laboured" , "Stretched, extended to the limit" , "pushed to the limit?" , "Forced -- like baby food?" , "Under stress or lacking spontaneity" .)