Thanks a million Tevor and ab.
Ash has just emailed me to try and post my solutions again. He's done a wee tweak. If it works, it will be great. I'll copy and paste now:-
1. Ecuador = EC (IVR); to join the = to + the; soldiers on board (perhaps) = Royal Marines (perhaps => there are others) = RM. ec + to + the + rm = ECTOTHERM = cold-blooded animal (Chambers def) = cold-blooded creature.
2. mark = sign; assuming = if (Chambers thes); I’m unable = I can’t; to return = ot; her = a female (Chambers def); sign + if + icant + ot + her = SIGNIFICANT OTHER = a person’s sexual partner (Chambers def).
3. net = web; reached = came, almost reached = cam; WEBCAM = online viewer
4. subtractive anag (without & uncommon) of “fleecing vipers say” – “paying” = SELF-SERVICE = helping oneself.
5. Man, for example = isle; just = fair; just, put down first yields FAIR ISLE = a type of design … (from Chambers def)