Hesitation to put launch onto loch (7)
I believe the answer is:
shyness
'hesitation' is the definition.
(thesaurus)
'launch onto loch' is the wordplay.
'launch' becomes 'shy' (both can mean to throw).
'onto' says to put letters next to each other.
'loch' becomes 'ness' (Loch Ness in Scotland).
'shy'+'ness'='SHYNESS'
'to put' is the link.
(Other definitions for shyness that I've seen before include "Nervousness, timidity" , "Modesty, reticence" , "Bashful nature" , "Retiring quality" , "lack of confidence" .)